so i've been at it for 2 hours, and i can't for the life of me get the stir bar to stay on the bottom of my growler. i've tried all sorts of magnet configurations, hard drive magnets, harbor freight magnets. spaced off the fan center, directly on the fan center. nothing seems to work.
so i've been at it for 2 hours, and i can't for the life of me get the stir bar to stay on the bottom of my growler. i've tried all sorts of magnet configurations, hard drive magnets, harbor freight magnets. spaced off the fan center, directly on the fan center. nothing seems to work.
The potentiometer won't turn the supply all the way off. If you want a slower speed, you could piggy back a second behind it.
Later,
are you able to run POTS in series? i asked a few ppl i'm friends with that had formal electronics schooling and they didn't know for sure or were playing dumb.
i haven't stirred a plate yet but the POT doesn't seem to have a wide rpm range control imo but again i haven't run it in a real world ap. yet. i'm waiting to go and get some stand off screws tomorrow to complete the build and test the functionality.
i built mine per specs of the original post except i was only able to scronge a 2" or so computer fan not a standard 4"....
side note: radio shack employee aren't that bright. also the first rocker switch i bought was bot of box failure but i soldered it and didn't check continuity between power and load prior to soldering... opps
Yes, you can run potentiometers in series. Your friends were either playing dumb or they paid no attention what so ever in their "electronics schooling", as it's pretty basic.
Yes, you can run potentiometers in series. Your friends were either playing dumb or they paid no attention what so ever in their "electronics schooling", as it's pretty basic.
SS won't work as it's not ferrous and cannot be magnetized AFAIK. I think there are some types of SS that are somewhat magnetic, but only weakly so.
That's basically what I said.
What I was getting at was that although there are grades of SS that ARE magnetic, either of the two types you would want to use, unfortunately, are not.
What I was getting at was that although there are grades of SS that ARE magnetic, either of the two types you would want to use, unfortunately, are not.
My main point was that a DIY stir bar doesn't make much sense as the manufactured ones are inexpensive and readily available off the shelf.
So, I followed the original thread exactly (at least, as far as I can tell), but I'm unable to get my fan to spin at all.
I'm using all the exact parts from the OP, a 5v Motorola wall wart, and an 80mm fan. The wall wart has two black wires, one with a dashed white line - I took the wire with the line to be positive, and the flat black to be negative. The fan has red and blue wires, so I assumed the blue to be negative.
Any idea how I can troubleshoot this? I'm not much of an electrician...
So, I followed the original thread exactly (at least, as far as I can tell), but I'm unable to get my fan to spin at all.
I'm using all the exact parts from the OP, a 5v Motorola wall wart, and an 80mm fan. The wall wart has two black wires, one with a dashed white line - I took the wire with the line to be positive, and the flat black to be negative. The fan has red and blue wires, so I assumed the blue to be negative.
Any idea how I can troubleshoot this? I'm not much of an electrician...
The fan should have a rating on it. I.e, voltage and current. What does it say exactly? Same for the wallwart. Try reversing the wires (briefly!).
The fan should have a rating on it. I.e, voltage and current. What does it say exactly? Same for the wallwart. Try reversing the wires (briefly!).
It's a 12VDC fan, 1.9W, .16A. I reversed the wires from the wall wart, which fired the fan right up. I guess I should have tried that. Thanks!
Doesn't seem to spin all that fast, but then again, I don't really know how fast it should spin. Won't spin at all with a magnet directly attached, so will have to add some shielding, looks like. Once I get a stir bar, I'll have to figure out if I have enough juice...
Linear Mode
